Want to poop out, left lower abdominal distension pain may be chronic colitis, intestinal obstruction, irritable bowel syndrome and other causes. 1. Chronic colitis: chronic inflammatory lesions of the intestinal tract, prevalent in the sigmoid colon and rectum. It can cause want to stool not come out, left lower abdominal distension hidden pain, usually accompanied by diarrhea, abdominal distension, mucus, pus and blood stool and other symptoms. 2. Intestinal obstruction: it refers to any obstacle caused by the passage of intestinal contents. It mainly manifests as abdominal pain, nausea, vomiting, abdominal distension, stopping defecation, etc. It can also cause inability to pass stool, left lower abdominal distension and hidden pain. 3. Irritable bowel syndrome (IBS): It is a functional bowel disease without organic lesions. It can also cause the desire to stool does not come out, left lower abdominal distension hidden pain, can be accompanied by abdominal pain, diarrhea or constipation, abdominal distension, fatigue, insomnia, anxiety and other symptoms. There are many other causes of the left lower abdominal distension and pain, which should be emphasized, timely consultation, identify the cause, and follow the doctor’s instructions for further treatment or therapy.